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It's not quite as simple as outcrossing ...even assuming any breeder of Cavaliers would want to.

What has been found is that in pups before birth there is abnormal cell division in the bone, but also more importantly it shows that the brain and the skull bones are not able to communicate properly with each other. This means that when the skull bones stop growing, they are not able to tell the brain to stop at the same time and the brain continues to grow a little while longer.

So if this is the case, you could breed Cavaliers as big as Great Danes by crossing them with something else, but if the brain and bones still fail to communicate, you will have the same problem.

... why than not try to make the skull of the Cavalier big enough for the brains by crossing with another breed?

The cavaliers' skulls are quite big already, in proportion to their bodies. The problem is not with the size of the skulls. It apparently is with the relationship between the embryonic growth of their skulls and their brains.

So, if we could find a breed that looks just like the cavalier but whose embryonic brain stop growing at the same time as its skull does, then we'd have something worth looking into.